Quote Originally Posted by Cody View Post
I'd say its less to do with raw power, as magical girls have fancy esoteric abilities. The problem is speed, and the vast, if not all magical girl series don't have much in the way of ridiculous speed(outside of travel), and tend to be glass cannons. This is a problem in a setting involving super speed class 100 brick that blow crap up on a wide range scale at high speed.

Remember that ToP more or less opened up into a giant light show of highspeed explosions. The entire tournament only took 40 some minutes in real time, everyone at the start of the tournament opened up with varying levels of superspeed at the bell, essentially. Mostly with big explosions.
A webcomic that I follow recently showed a Magical Girl whose primary magical ability was super-speed [She had a weapon as well]. Thing is, by herself that is all she had and it wasn't enough to keep her from losing an arm and being depowered.

You would need a Magical Girl who had a powerset that included super speed, as well as other abilities including durability. Of course, if you had someone with near reality-altering magic that could disable anyone else regardless of how powerful they are, then maybe that might work. But even if Wanda, the Scarlet Witch went up against them, there is no certainty that she'd have the time to do anything before being knocked unconscious.